Rare Random Encounter

Im starting to make the first part of my game where there will be random encounters, and there is one enemy that is slightly stronger than the rest that you will be able to battle. I want that creature to be rarer to encounter than the weaker monsters. Is there any way to do this through events? Ive been using RMXP for a long while yet ive never figured this out

You can do it simply. Instead of adding only 1 time the monster team on the map, add like 5 times each weak team, and only once the rare one. That would make it 1/5 to fight the rare monster.

Oh wow its that simple. Damn. I didnt think how much you added them mattered.....thanks for the help